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Definition of andalusite. : a mineral consisting of a silicate of aluminum usually in thick orthorhombic prisms of various colors.
The rocks thus extruded are mainly composed of dark, heavy basic material, such as basalt and andesite. In the main the lava is an andesite, and is very generally of a porphyritic structure. The rock in which the Hungarian Opals occur is eruptive, and of the kind known as andesite.